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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542c61da0dbe661cecff7b807548fff6b7d272aec8540af6e5a790d021990372' 
  AND token = '7Y2AY/KO6LGyRNmWjAA/NS4pOSRWQ+BVZdHfXtkOM8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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