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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08d5e4f10eb3faf69a86d7d6f8052775898711652f1285f7a19167faf5534c0' 
  AND token = 'dTAdvBoE7I3kktn8nzTpHhzHNNsELupa4t6wgwovgbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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