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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705ce595effff1f502307840a2f1681dc8560342ef5d5066c516fb0258f841b1' 
  AND token = 'JNfdYxD3toDlAkljf7fL1ZlpZYVQfu9r6T8sqSz8dms=' 
  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"
    }
  }
}