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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c3a3e28e978147fef408759fddd3d0374ceddcc7200306fff561cdb2ca4046' 
  AND token = 'b4TASR2WzVO2J3St/7RtendioB9ZNHEqE0B/O6bDGKI=' 
  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"
    }
  }
}