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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5361b14af22227020182c8428d7372c2bb3eeda7a02d41a53f2327847e725c57' 
  AND token = '+FzhwBsnf0UPaQsFsx5p74scB7ta29UZGomMZQ9DP6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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