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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccbe022363bb179b678ac8632c72b82507c1a47a7ad2975dbd7d614389154f8' 
  AND token = 'npJ5e5GcxjKTORd4JL2TGeD8G9Rh6RSUOgySidmYpA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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