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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a47d6d20e8f449c2eceed3a033de0ea72b257145bc5c1dcc9e40466d0d378c4' 
  AND token = 'uNUbsi1l6m7K31RG/mSKccaZKvhzEYp8yY6AESnB2vY=' 
  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"
    }
  }
}