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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021d9bbcc8d3a1e1e6e25feba50b9c8c4a4fefac817376101269ec387d67f093' 
  AND token = '6ZDoO9pLpbfs4N9uP1dBNcsQABxmN/sOVEGEVV+5jSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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