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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed80fbacccc0d62471d6c76508e2ed7488892b785292f31c2fb237e7d997d02a' 
  AND token = 'T3n6dlPlRM9TMyhL8sRgb2JdiFPp3peYd7L+TIzjApY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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