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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703342fd9204e6d6fadc0b81f61dbfe266b5e82f469be3a6b5858721660dbca1' 
  AND token = '4UfNukZJRD5lYjrsWzttQmGYI1B+MwAoBGXe4uLX4IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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