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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe1867a7a459f930c284fedfc79d3a9e4f4e9f21c8d40cccfd4171b3f09a6a6' 
  AND token = 'tpAr0ED8YL5RxKbIleHr6LQrmhDd+u2H3VKRawiOPtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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