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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3dfa5cc14680848e1d66e3ba3b89c4d285824e9c0e2980ceff61884c2f1dd4' 
  AND token = 'q7d5lARBgpOW/sg4+dqU7ysTZWPERURVOVTgRI2hi9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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