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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277cbc2e3a3e9b44c3b141c9054d0579513a02f0d7ffcd0f55748081ac92f68e' 
  AND token = 'SGzxT5d5ViKEWPHFR4vV3hlyR8K10dsErI38Wv4Wwf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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