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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a052ef4dcb26ef12a66baedc2b1359b6b81bef649ea2c10c97aa450f9210b54c' 
  AND token = 'aA3+dwjV7OWPv9AabYI9fN/+lp3EuRHe6U5PKhVJIZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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