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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7571f0e118c7d295123c0a64bc478c5641a52966d8f8bd2b4c6c2f16004ba0' 
  AND token = 'y2JotaCqx5UY/y+uxZbEPCI03MTLIfrWpk29+N3ZERc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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