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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48221af1b21b0093b654d8983ef51d59cd86d8ce51f29e44d16b4aee28236652' 
  AND token = '7dzobnaIDHUMmy9GyIm/tDl/D0VmI0JjF+exY8X6awU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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