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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eab43df7c87d23baa5525ead5c84a30a5c6f7fdaee9ee73ea236011409868f3' 
  AND token = 'F69HxWbsVdPleyN7LphR/9hdrR/OH9qa2EMyJoM84Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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