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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12708077502b99c19e0d358009b94ae4a2de34891b5d7a4c72054cb231ad42b' 
  AND token = 'WCFSc4kDhvxfFMmSzIqCAtpiXAv+C935Ty63XgMe2/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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