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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f2e860887cf05ba26a48999667ae9c4ba557bb73399e2466a2513b96a6bf862' 
  AND token = '2TVjE3NbpOw/TTmxQ5rvFeOr57xt5xO9A4DtxD2tHwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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