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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6df3bc9b75df0744afe58746147d231d4a54d8f44294d1b346919a9fcd32890' 
  AND token = 'yB4McfM2fjxZXPr7PaPi+JE0qXSw0D/QPMwjlHFJUQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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