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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c2e957df9832ab01f0aade535704aee96ba86e438657962497c6bb82b5a97a' 
  AND token = 'kxYWj3Wk3vAa8OWkukWVShpWPTEL8mmVHKrS4B1tszQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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