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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0b67f594189dafb799b06282afca1f9a45c6f4cb7a92bfece03cc585128fde' 
  AND token = 'xDfCMUSzkRTZCwk5o/1pprR5o/m/yW4u6v2h4o0BTqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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