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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ad06bd4ad02848cacf4de0579d6d5e06b8bdba339295e7850cd0625a57abf8' 
  AND token = '1yoj7YAdCNMLwhIrxNDOr/BfCQ4T2kD0vy4A6SLN7gc=' 
  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"
    }
  }
}