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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7fb359f4e4f0110141c48e2ef5c7bfc24496daa12b6eb5e446b9ae68ed38783' 
  AND token = 'E1HIHRljI7aVL2rL2WZnVlByCrFG4qFokrSdadF4cTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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