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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f1f4b597d28bc62b61a018b8e98e183799973daca629c2c83288dd1bd31a76' 
  AND token = 'tTr2G+rLdHOJtm3JtGyrLpm9TpnO+v9680By1gF/CnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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