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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcc7d2c5bc809984964f68f7261a064163cd9ff0378a39aef8f0406c00eb117' 
  AND token = 'eK5R0i6X3t+SyuqWmsNTYX/Wpt59PAOQQq/d/H+HcOY=' 
  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"
    }
  }
}