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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6f769e97947cdb42b976490010ee2343703fd34e1597d8b0ef6c94c20a4c8a' 
  AND token = 'OsvNpnffrdbVCVccaCcwM9TIlNVurU3F/4TcJZ0rA+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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