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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0669196f39092e0745f56bc5eaf4dff09c93b6b285c3038c642a75cd13e51f' 
  AND token = 'UEBSlCHElbdzx2uD0wVP8ARE107+k/L1N8xQcgxlHu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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