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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853e8190ee975a0c4522ce55253e92e48c47050a6a6e07f4707d757419b327f1' 
  AND token = 'wgYElbwYxUY1xchL97GfsOwk2sffxfkKGF9SpAGRCMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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