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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e2f074180e06530d71619e3417cdb1838db34f042b5cada135af32277c8146' 
  AND token = 'HzdxKQUrHJ8JtXpAtIvd2Eg/WylEAr6KnDdc3kFJ9dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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