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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24170168e2e564e9011f20c747c41b11505d7fcf2a1d813476829f1e1a90138e' 
  AND token = '76E8wHEAm4giFLbmJ0+8Q85BpUc8WpmrxWD2cSpE7KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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