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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886e44871f1187be1e9f213ad469cb4e09d45d46d72229ce4db9114c5d4a2a75' 
  AND token = 'Yb0pyoQ154pRN0z1kzHZ2qafHRrRpPMUfyciIBTiIj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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