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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e928a8ad1dc83d2c01e75f039eb1bc540a4c0b4030f0b48e54e51a3cad1c99b' 
  AND token = 'YVHxxg2+zk6cPpR98L2cYIf8bbITMdeEbHpiQ+6Pt4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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