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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee0eaf7b05e9e112c80bbbd4eeeb49b6265d3441b20c8d3d739cfdc9c981fa8' 
  AND token = 'p2E7xBLn3HyRdGY30Dq6T3B6L3V+GFgVKBPumvRktA8=' 
  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"
    }
  }
}