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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e0935e6b5e59570d362626e3f0753cc910cc5a27ebb477dbfb674d563c4ff4' 
  AND token = 'l2J/5v+rl/vg8JOZ6F9LMIinZqNGF4iEmZaih9RaTvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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