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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2b16f2782b259f18c5e6c5fbf7f44375664b9ccdb14d144a69250279dc23b0' 
  AND token = 'H/IvsErdNRkEKtML/cF2kiN40r8F8KWQLNOjq0wWVHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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