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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82deff33b64a011016f8421409ddb48b495c0b723c9a4ce1af6b15fcc55af270' 
  AND token = 'vCcI/XWb2gExNTDnEAXSejW3RLZpRg90Jh2KcTJEs2M=' 
  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"
    }
  }
}