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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb6445c66c81f152dc84669abd2259e72d2e76434dfad301f8a0f06b301f603' 
  AND token = 'P63jU7rNXyvaCuFGAMZW3e7jS3NBMB9HabIQ0ZWqYbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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