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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390b44dd76a4bc141e39f311987d80272399de5bb003fd9ce4fcd0081d6cbb70' 
  AND token = 'Vqz7Fe36C/i9xBG6N9YQKKMdMxFjSDFuKjj0M2ba2vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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