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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c86af813808c1ff6a3ee5ab40fa981155a5d66f248b53e703f2cc207784bd4' 
  AND token = '+t9eAFEvrPW4vZZeOT+eYOUMAR67wmWybW2OrX/7SnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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