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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f5504e4d32b638bbc20851469a5bbce8350cc27f450ea4d68b342397c3de4d' 
  AND token = 'T8ms3DMzfNGJqs2FGTS4veO4fjgyvpyMFxISUMCzh9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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