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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b51e4dae152156cb5cee243cc9bc63a153a2138fcb0d700d79aef6560bd18d' 
  AND token = 'pc2IevXqa5Hf/l/u9nRHl32om2BVGLeXnbfIPyO1/mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}