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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34899221d72b6f2af58fa9f131a45154cdcc4e7a82513f206a1f2d838b5442e0' 
  AND token = '7X4QhntRnFetmvFfQQxn+cjDX6J1k4/8mdt5krU2Dik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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