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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fd29eda5a3a7060a05f9a473e5c112a18ad3765c8f104777520f2e8f692ebe6' 
  AND token = 'T1NEPGF2gLUtvFig6cvARwMvGQ9N9JbMWuQdyeZucXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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