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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f082eabcb80be5d050be34eec01810ad8e41c23bf4dadd4aab4f51cdad44ce2' 
  AND token = 'cAF9Tq2KYTMNpmEM3Ze02iSo5kyOXfVn+Fl7UsKd15I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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