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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3e6e6cb23d800ea3be4e30d9726fd1675834f2ed9ded31149ca45cad7269ce' 
  AND token = 'Vb+K8LODXeRxvHL3mZONdRdviMNtdSuMftRvu/mH6oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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