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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966eed11ec1a04311af173de2821bf5dd7dba336d4ce4983d112b253fbfbe5fa' 
  AND token = 'wBPr4Dm4WPw96qPAHK3TdmIq2f1q24d96Cf4EKcDcxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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