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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74dadd6571a3b12d6d86141b0708f2b601c83ce3d4ae4acf40e05d385e2e6706' 
  AND token = 'A8E9GY4NQpNb4OVUro7YSTzScZQUE3FKQ/hvlkxvifs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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