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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd29f35894a234e6464c0f79c8b3875d68c789b3e01f78fda274bf9b06304fd4' 
  AND token = 'il2Hk2Zb4uwPY3XsWaTGGb5zESW/6cwx5nUlkxxDLBk=' 
  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"
    }
  }
}