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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7b29ae1d4cc48855b406cfc2c1f5414b23805a2901dac477aa4f99a6c8fc96' 
  AND token = 'NSxkMq8cwav1o2eB6BzastxGtDZpoaFH5B3znoHcnsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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