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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14476e28275558ea2aa4a45036ec192445930c105e6e7dee31d1fdaf86796532' 
  AND token = '2K0DNuKn9GUt6+VYiPhGVE7xfzra1k9G4awXuVvmdaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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