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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40f5b43bdd01d9c6acb24a475f9d1a6770a8c6741a73cb1d007cccdc512691e' 
  AND token = 'ByqJzv+C+OHr6f5NQp2rTKFWxF+SImT4MfJzQc6UJks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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