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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efda8c183dfcd9addcf6efc0f18fb7e86a735998a6b5418b7cdbbc8a47b77d86' 
  AND token = 'FWph4hHzyB7y5jIwnx0d8TIHvu+EeUUGUQI5Phf4mD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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