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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1a84e2c0cde0dd3235c7b137457ed441aa1955cddea7ffc3ce044f643f883b' 
  AND token = '58Qb7nV1XBc8EWB+CK9i0BYysEAY2T5cQrS47WPHoxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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