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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a9bab5776cdccde2bc56059c2ad6ac842b9c8ad02336fde3cf4dd767a5958b' 
  AND token = 'W8BAQETutL9ppG2sTGhuweD1vmblBtkLrtCObCVwwIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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