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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103e519545f3ab6ec32ac255dcabdea0fd758a9f5c4ced918c02815b1b30fd6e' 
  AND token = '+SANo69NJI2ZWBMzlorR8OG9dlYSbuLIegklfUCx1yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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