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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1571f738e759a0a01b6bccd48ea023bf3816e31c32d0bfe4155147e99cd24a3' 
  AND token = 'noGqPqZE3+b123lIv88jOZI0OSMZz9j7BAolcpMi2m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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