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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4acbb2aa258d4fedbcd223ea2abb89562413fe34ea23b37c512dbf111901cd6' 
  AND token = '1e1dpnRUOGF6jrgODhgHJOR2z7Pod0Vy7COVyU0Ka98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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