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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d97b8f7e40759c700b58ac35d1d47050a0246795b79685065d1b3aa4a45fb7' 
  AND token = 'ouhxKnvcqw1JREn7chkstnX+PlCUxRcHz1crfbe3Hhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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