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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7694f73080113b57c54d909c4a4345ef83c5c547fbfdcd193af5d72287046ee8' 
  AND token = 'f6MQLsed1Aeqt0qLuWUFLVXPUDP+TbMV8dEMtqW4Lb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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