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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3e8bbea9dd3d521bcec867d2ded1e5fb0a1e39711464f7bfe0e488a5535a98' 
  AND token = '3dU7RN7xxlbnOw8XzcGUFV1oQOkFplr/SEf5P+HRZpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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